OSPF Hub-and-spoke Tutorial Monroe MI

This article offers some effective methods to deal with Ospf Hub-and-spoke of Cisco Ccna Certification Exam. For more information, read the following article.

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Make sure the hub is the designated router and that there are no backup designated routers. This is done by setting the OSPF interface priority to zero on the spoke routers. This not only ensures that the hub wins the DR election with its default OSPF interface priority of 1, but it prevents the spokes from ever having a chance to become the DR or BDR.

Configure neighbor statements on the hub. Since we're dealing with an NBMA network, the hub cannot dynamically discover its neighbors. Neighbor statements are not needed on the spokes. (They don't hurt anything, but they don't do anything, either.)

Finally, if your OSPF adjacencies do not form as expected, make sure to use your OSI model knowledge to approach the problem. The issue may actually be at Layer Two, with your Frame Relay configuration. If you don't use the "broadcast" option on your frame relay statements, OSPF hellos will not be transmitted successfully between potential neighbors. OSPF hellos are multicast, but the "broadcast" option for Frame Relay includes multicasts.

By paying special attention to these details, you're that much close to CCNA exam day success and earning your certification. I recommend that you get some experience with configuring OSPF hub-and-spoke before taking the CCNA exam, because it’s by actually performing tasks such as this that makes you supremely confident on CCNA test day.

About the Author:

Chris Bryant, CCIE #12933, is the owner of The Bryant Advantage (www.thebryantadvantage.com), home of free CCNA and CCNP tutorials, The Ultimate CCNA Study Package, and Ultimate CCNP Study Packages.

For a FREE copy of his latest e-books, “How To Pass The CCNA” and “How To Pass The CCNP”, visit the website and download your free copies. You can now get a FREE CCNA and CCNP exam question sent to your email inbox every day! Get your CCNA certification with The Bryant Advantage!

chris@thebryantadvantage.com

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